Modeling and mapping high arsenic and manganese concentrations in the glacial aquifer system, northern USA: Using machine learning methods to predict water quality conditions in an extensive, stratigraphically complex, unconsolidated drinking water aquifer system

Melinda L Erickson, U.S. Geological Survey, Upper Midwest Water Science Center, Minneapolis, MN, United States, Sarah M. Elliott, USGS Upper Midwest Water Science Center, Mounds View, MN, United States, Craig Brown, USGS New England Water Science Center, Northborough, United States, Paul E. Stackelberg, USGS New York Water Science Center Troy, Troy, NJ, United States and Katherine Marie Ransom, U.S. Geological Survey, Sacramento, CA, United States